Antenna



FIG. 1 is a top plan view of an antenna, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top perspective view thereof;

FIG. 5 is a top plan view thereof with unclaimed environment not shown; and,

FIG. 6 is a front elevation view thereof with unclaimed environment not shown.

The broken line in the figure drawings represents unclaimed environment only and forms no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 